Type-mold.



J; S. BANGROPT & A. L. KNIGHT. TYPE MOLD.

APPLICATION FILED DEO.10,1909.

952, 6 66 Patented Mar 22, 1910.

nnrrnn STATES PATENT oTTTcn.

JOHN SELLERS BANCROFT AND AMOS L. KNIGHT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORS TO LANSTON MONOTYPE MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF VIRGINIA.

TYPE-MOLD.

Specification of Letters Patent.

Original application filed June 7', 1909, Serial No. 500,553. Divided and this application filed December 10, 1909.

To all whom it may concern:

Be it known that we, JOHN SELLERS BAN- cnor'r and Arms L. KNIGHT, of Philadelphia, in the county of Philadelphia, State of Pennsylvania, have invented a certain new and useful Improvement in Type-Molds; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the numerals of reference marked thereon.

As is well known, an exceptionally high degree of accuracy is required in the construction of type molds, more especially such as are provided with adjustable or movable members for varying the dimensions of the mold cavity, opening the latter and ejecting the type, wherein the maintenance of form is complicated by the necessity for metal tight joints.

One of the most diflicult of the many problems presented is the locating of the nick pin or protuberance for forming the nick or transverse groove in one side of the type. The mold blade or equivalent member coacting with the mold block or member to which the nick pin is secured, is grooved on one side to receive and fit this protuberance and at the same time rides upon the floor of the mold blade channel, hence to maintain a metal tight joint all around the mold blade at the casting face of the latter, the nick pin or protuberance on the mold block together with the groove in the mold blade must be accurately positioned relative to the floor of the mold blade channel, in

order to avoid the binding of the parts or open joints.

The problem is further complicated by the circumstance that, for practical reasons, the block or member carrying the nick pin or protuberance is required to have four or more of its surfaces dressed in planes intersecting at predetermined angles, usually 90. Take, for example, Patent No. 752,814, of February 23, 1904, which illustrates a commercial form of type mold. The side block carrying the nick pin has its front and rear surfaces dressed in parallel planes perpendicular to the base or under surface, the inner or nick pin surface in a plane per- Serial No. 532,475.

front and rear surfaces at right angles there to, and the top of the matrix seat in parallel with the base.

The tolerance, z'. 6., permissible degree of variance from standard measurement, is so exceedingly small that it is found commercially impractical. to make the protuberant section integral with the mold block, hence it is customary to make it in the form of an insert and to apply it after the faces of the block have been dressed or lapped to the required dimensions.

The more common practice is to form an undercut groove in one face extending a short distance from one edge and as near as may be parallel with the base at a predetermined dist-ance therefrom. This is usually done by drilling a small hole near the edge and intersecting the mold blade face. This, in itself a somewhat dilficult and delicate operation, is required to be performed prior to the hardening and finishing of the block, in consequence of which it not infrequently happens that when the surfaces of the block have been trued up the nick pin recess is found to be either too near or too remote from the base, so that an after treatment of the inserted nick pin is required to bring it into accurate registry with the groove in the mold blade when the latter is seated in its channel, or, in the alternative, the mold blade must be grooved to correspond with the distorted position of the nick pin.

As the nick pin is the variable factor the most approved practice is to dress the nick pin to standard position and proportions, in accordance with the interchangeable plan of manufacture. This adds materially to the cost of construction as the operation is a delicate one requiring the exercise of a high order of skill and considerable time. Difficulty has also been experienced in securing the nick pin in its seat against longitudinal displacement. The pin is short, (from 3- to small in diameter, (approximately .081") and of a material, usually steel, adapted to stand up against the friction of the mold blade and the action of the molten metal injected under considerable pressure into the mold.

Now the primary object of the present in vention is to provide an effective, certain pendicular to the base and intersecting the and cheap means for accurately positioning Patented Mar. 22, 1916..

and securely fastening the nick pin to the mold block, whereby the inaccuracies in the location of the nick pin recess due to the finishing of the mold block are automatically compensated for and the subsequent dressing of the protuberantasection rendered unnecessary, and, at the same time, the nick pin is securely anchored in its seat in the mold block.

To these ends the invention consists in a type-mold block or member provided with an inserted nick pin whose outer or protuberant section is die shaped for form and position while said pin occupies its seating recess.

The invention also includes a type-mold block or member provided with an expanded tubular nick pin seated in an undercut groove or recess in the face of said block or member and having its outer or protuberant section die shaped for form and position.

In the accompanying drawings illustrat ing a preferred means for producing the improved type-mold block or member Figure l is a longitudinal section through the sub press equipped with the mold block holding and nick pin blank deforming appliances, the nick pin blank and the recess in the type mold block being enlarged disproportion ally. Fig. 2 is a perspective view of the nick pin forming die and means for adjusting and holding the mold block, the nick pin blank being in position to receive the deforming pressure. Fig. 3 is a sectional view of a portion of the sub-press showing the nickpin after being subjected to pressure. Fig. 4 is a diagrammatic top plan view illustrating on an enlarged scale the nick pin forming die adjusted to a mold block with a displaced nick pin recess and a tubular nick pin blank in position for the deforming operation. Fig. 5 is a similar view showing the effects of deformation. Fig. 6 is an enlarged sectional view of the nick pin and a portion of the mold block showing the interlocking effected by deformation of the nick pin blank.

Like numerals designate the same parts in the several figures.

As illustrated in the drawings the typemold block or member 6 is provided on one face with an undercut groove or recess 7 for the reception of the nick pin blank. By the application of a deforming pressure to the inserted blank the latter is expanded into contact with the surrounding walls of its containing cavity, said walls being com posed in part by the groove or recess 7 in the type-mold block or member, and in part by a communicating groove or recess 3 in a die block or former 1, the latter supported in fixed predetermined relation to a base line on block or member 6, whereby the nick pin is formed in position and thus confined to its seat and. its protuberant section die-shaped to conform in shape and location 'to groove or recess 3.

It is of the first importance that the die for giving shape to the protuberant section of the nick pin should be firmly clamped to the mold block and accurately positioned relative to the base or other established datum line on said block. To insure this a die block 1 provided with a fiat face 2 and transverse groove 3, the latter corresponding with the protruding section of the nick pin and the complemental groove in the mold blade, is secured within an opening or re cess in a block or holder 4 with its face 2 perpendicular to the face of a hardened steel plate 5, the latter also secured to block 4t. Groove 3 being accurately positioned with relation to plate 5, the latter serves as a datum line or gage for locating the protruding section of the nick pin when the mold block 6 is inserted and clamped with its base upon plate 5 and its nick pin face against the face of block 1. Suitable means, such as wedges or screws, are employed for securely and firmly clamping the mold block into the angle between the die block 1 and plate 5. If the undercut nick pin recess 7 in mold block (3 happens to be properly located with relation to the base or datum line of the latter its edges will register with corresponding edges of groove If, however, as is frequently the case, recess 7 happens to lie slightly to one side of the standard position, due to the dressing performed upon its base or the inaccurate forming of said recess, or in the event it is desired to increase or diminish the lateral dimensions of the protuberant section of the nick pin relative to the width of recess 7, the edges of the groove and recess will be more or less out of register. A displacement such as above referred to is illustrated in Figs. 4 and 5.

Having secured the mold block and die block in the described relative positions a nick pin blank 9 is inserted within the cavity formed by the junction of recess 7 and groove 3, and sufiicient pressure is applied to said blank to cause it to expand into contact with the walls of said cavity, as indicated in Fig. 5, the portion conforming to and contained within undercut recess 7 serving as the means of attachment to the mold block, while the protuberant section not only takes the form of groove 3 but is at the same time accurately positioned upon the mold block with relation to its base or other datum line.

In the example illustrated the hardened steel plate 5 is held to position by one or more bolts 16 extending through the wall of block 4- and threaded into said plate, and die block 1 is in like manner provided with a similar bolt 17. The mold block 6 is held firmly in contact with the face of plate 5 by means of bolts 18 threaded into block 4 with their inner ends engaging a shoe 19, the latter interposed between said screws and block 6. A wedge (not shown) or equivalent means inserted in the space 20 between blocks a and the end of block 6 serves to hold the grooved face of said mold block in contact with the face of die block 1 while pressure is being applied to the blank 9.

The deformation of the blank is preferably performed by cold pressure and to facilitate this the blank is made tubular or hollow and the deforming pressure applied to its interior.

The lower or inner end of the blank engaging the end wall of recess 7 is closed, as by the insertion of a plug 10 of soft metal such as copper, and to facilitate the insertion and engagement of said plug the upper section of the blank is formed with a slightly enlarged bore, so that notwithstanding the small dimensions of the blank (less than .081 diameter) the plug can readily be entered therein and when entered will drop by gravity or may be forced into the smaller bore at the inner end. 7.

In Fig. 1 the plug 10 is illustrated as engaging the inner end of the smaller bore, into which it is first forced and then ex panded by the pressure transmitted through the liquid above said plug, this method of inserting the plug being preferred as tending to prevent accidental escape and accurate fitting of the plug within the smaller bore, otherwise the plug might be fully entered within said smaller bore before pressure is applied.

The upper end of the blank projects beyond the mold block and die plate and is fitted to the open end of a cylinder 11 charged with a fluid, oil for example, and

equipped with a piston 12. The piston and cylinder are supported in a head 13, the latfor resting loosely upon block 4 and provided with dowel pins or equivalent means for alining cylinder 11 and blank 9.

The parts being adjusted to position pres sure is applied through piston 12 to the liquid within the blank as well as to the soft metal plug in the end thereof upsetting the latter and causing the blank to expand radially in all directions until its exterior surface conforms accurately to the inclosing walls. The application of pressure to piston 12 may be performed by a weight of approximately seventy pounds falling through a distance of about twelve inches and the drop may be repeated if required, although in practice a single drop of the weight is usually sufiicient. Other known means, such as an accumulator or hydraulic press may be employed to produce the required pressure within the blank, but that described has proved effective in practice.

To prevent the accidental displacement of the nick pin under normal conditions of use, the wall of recess 7 is furnished with one or more lateral depressions or projections, illustrated by the depression 15, Fig. 6, into which the material of the nick pin blank is driven by the deforming pressure applied within the latter. After the nick pin has been thus formed, seated and located all that is required to finish the mold block is to dress off the projecting end flush with the face of the mold block.

The method of forming, attaching and positioning the nick pin herein described is not claimed herein as it forms the subject of our prior application Serial No. 500,553, filed June. 7, 1909, and of which this application is a division.

Having thus described our invention what we claim as new and desire to secure by Letters Patent, is

1. A type-mold block or member provided with an inserted nick pin the protuberant section of which is die-shaped in position.

2. As a new article of manufacture, a type-mold block or member provided with a tubular nick pin expanded to its seat in the nick pin recess.

3. As a new article of manufacture, a type-mold block provided with an undercut nick pin groove or recess and a tubular nick pin, the latter expanded to fill said groove and protrude beyond the face of the block, the protruding section being die shaped to position.

4. As a new article of manufacture, a type-mold block or member provided with an undercut groove in one face with an offset in the wall thereof and a nick pin expanded to fill said recess and interlock with the offset therein.

JOHN SELLERS BANCROFT. AMOS L. KNIGHT. Witnesses FRED WEINDE, Jr., HARVEY W. MONKS. 

